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Start by removing the load from the fuse at the opposite end of the conductor and see if the fuse will hold. if not, the conductor is shorted out. If the fuse does hold; reconnect part of the load (If possible) and see if the fuse holds or not. Diagnosing is a process of elimination down to the root of the problem. Make certain that you have good operating voltages as low voltage can cause a good circuit to blow a fuse as well.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7